Abstract
This work presents a novel method for directly growing highly oriented Li-Al LDH films on substrates such as glass, Si wafer and carbon cloth in an aqueous alkaline Al3+- and Li+-containing solution. The substrate samples were each hanged and then respectively immersed in the solutions at 5-35 °C for 20 min or less than 6 h to form the LDH films. The Li-Al LDH film comprised of extra-high-density Li-Al LDH platelets, each standing almost perpendicularly on the surface of the substrate. The LDH film that was fabricated at 5 °C (∼1.4 μm thick) exhibits good UV shielding (with only 9.7% UV transparency) and a maximum of 56% transparency to visible light. A more rapid method (only 20 min needed) can be utilized to develop a Li-Al LDH film to cover both hydrophobic and hydrophilic carbon cloth surfaces. Despite the modification of these surfaces, the Li-Al LDH film on carbon cloths retained or enhanced their original surface properties (including hydrophobicity or hydrophilicity). The LDH film thickness increased with immersion time and/or solution temperature. The thickness reached a plateau during LDH formation. CO2 in the atmosphere dissolved in the alkaline Al3+- and Li+-containing solution, yielding CO 32- ions for Li-Al LDH formation. The heterogeneous nucleation and growth of each LDH platelet on the substrate surface finally produced an LDH film.
Original language | English |
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Pages (from-to) | 1880-1889 |
Number of pages | 10 |
Journal | Journal of Materials Chemistry |
Volume | 21 |
Issue number | 6 |
DOIs | |
Publication status | Published - Feb 14 2011 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- Materials Chemistry